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@article{SF_1994__49_2_135332, author = {K. Denecke and J. Koppitz}, title = {Hyperassociative varieties of semigroups.}, journal = {Semigroup forum}, pages = {41--48}, publisher = {mathdoc}, volume = {49}, number = {2}, year = {1994}, zbl = {0806.20049}, url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135332/} }
K. Denecke; J. Koppitz. Hyperassociative varieties of semigroups.. Semigroup forum, Tome 49 (1994) no. 2, pp. 41-48. http://geodesic.mathdoc.fr/item/SF_1994__49_2_135332/